Q9. With reference to overcurrent protection for electrical circuits:
(a) Explain THREE methods of protection, stating where EACH may be used; (6)
(b) explain, with the aid of a diagram, the meaning of the term inverse current time characteristic. (4)
Q11. With reference to testing High Voltage equipment:
(a) explain why earthing down is considered essential; (2)
(b) state the operating voltage for an insulation resistance tester (megger) suitable for 6.6 KV equipment; (1)
(c) describe how an insulation resistance test is carried out on High Voltage equipment, making reference to personnel safety; (5)
(d) explain why infra red temperature measurement is used on High Voltage equipment. (2)
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